code: def num_atoms(self):
      return self._num_atoms
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from absl import flags
  import numpy
  import tensorflow
  from tf_agents.networks import categorical_q_network
  from tf_agents.networks import network
  from tf_agents.policies import categorical_q_policy
  from tf_agents.policies import policy_saver
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import time_step
  from tf_agents.utils import test_utils
label_desc: Use image node_id 2 for calling the DummyCategoricalNet obj's underlying member method code with example usage: obj.num_atoms() and returns: self